Stencil-duplicating apparatus.



PATENTED JUNE 16, 1908. A. B. DICK. STENCIL DUPLIGATING APPARATU APPLICATION FILED MAR-25. 1905.

WITNESSES? M. d? M/;

ATTORNEY UNITED STATES PATENT OFFICE.

ALBERT B. DICK, OF LAKE FOREST, ILLINOIS, ASSIGNOR TO A. B. DICK COMPANY, OF CHICAGO, ILLINOIS, A=()ORIORATION OF ILLINOIS.

STENCIL-DUPLICATING APPARATUS.

Specification of Letters Patent.

Patented June 16, 1908.

To all whom it may concern:

Be it known that I, ALBERT B. DICK, a citizen of the United States, residing at Lake Forest, in the county of Lake and State of Illinois, have invented a certain new and useful Improvement in Stencil-Duplicating Apparatus, of whichthe following is a specification.

Broadly speaking, the present invention relates generally to the type of apparatus disclosed in Patents Nos. 775,078 and 783,824, heretofore granted to me, to the extent at least that it concerns the attachment of a waxed sheet for stencil-duplication to the drum of a duplicating machlne not by securing the former to the latter directly, as heretofore in the practice of this art, butthrou h the intervention of a detachable stencil-Stu which may, if desired, be an entirely separate and distinct element from either of the instrumentalities mentioned, and which may be furnished to the trade largely without reference to particular provision forming a permanent part of the machine for securing stencil-sheets directly in place thereon. Thus, of the various types of rotary duplicating machines heretofore marketed, all include the common feature of a cross-bar or rod extending between the heads of the rotary drum, and in some cases this cross-bar or rod has been provided-with studs or projections adapted to coact with correspondingly arranged openings in the forward end of the stencil-sheet. Where, however, the stencilsbeet is not provided with such corresponding openings, or where, for instance, such openings have been injured or torn away, it is desirable in the interest of economy both of time and material to rovide means whereby such a sheet, either injured or unadapted for the particular style of fastening referred to, may be utilized, and this is accomplished in the present case by means of a stencil-stub of broad adaptability to the various t es of rotary machines. Moreover, I have ound that a stencil-stub of extreme simplicity and conseguent low cost of production can be provi ed, effectively answering the requirements here suggested. This consists of a sheet of a or or woven fabric or similar (preferabl y exible) material, which may be folded longitudinally so that'the two folded halves shall lie in substantially parallel planes. Such stencil-stub may be readily secured upon any moving part of arotary duplicating drum, as, for instance, upon a rot or bar extending betweenand connecting the heads of such drum. To the free/ends, the forward edge of the stencil-sheet maybe secured in. any suitable manner, as for in stance by an adhesive material arranged on the inner surface of one or both of such free ends and by which after the stub has been placed in position both members thereof and the forward edge of the stencil-sheet may be bound firml 1 together, or, if desired, the forward edge 0 the stencil-sheet may be pinned to one or both of the free ends of such stub.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a central vertical section of the drum of a duplicating machine; Fi 2 is a perspective view' of a stencil-stub em odying the present invention; and Fi 3 is a similar view illustrating a portion oft e stencil-stub and a stencil-sheet attached thereto in a somewhat different manner from that suggested by Fig. 2.

In these drawings, A designates the duplicator-drurn, comprising two heads a, the foraminated stencil-carrier a underlying the ink-pad a secured in position by end-rods a. The stencil-sheet a overlies the ink-pad and is preferably secured at both ends, or at the forward end only, in manner hereinafter described,

B designates a part extending between and connecting the drum-heads, in this instance taking the form of a bar, which may or may not be provided with stencil-securing means as desired.

C designates thestencil-stub. As clearly shown in the drawings, this com rises a sheet which, as above stated, may e of strong paper or woven fabric or other suitable material, referabl flexible, and is folded longitudina ly in order that the two halves c, 0, thereof may be passed on either side respectively'of a part of the drum, such as the bar B. f desired, the inner surfaces of the free ends of said stencil-stub may be provided with an adhesive material D, in order that after the stub has been placed in position as shown in Fig. 1, the stencil-sheet a may be placed between such free ends after the m ias, been moistened, and both the mem ers c, c, firmly united to the forward edge of such steneil'sheet. Or, if desired, the union may I be made by means'of pins E, as shown in Fig. 3, or both means of attachment may be employed, to avoid the possibility of separating the stencil-sheet from the stub during the operation of the machine. The particular means for securing the stencil-sheet to the stub may, of course, be varied within wide limits, the essential feature of the invention concerning more articularly the use of a chea and readi y ap lied stencil -stub, whic as above stated, s all be applicable to a stencil-duplicating machine regardless of the particular provision made in such machine for the attachment of a stencil-sheet thereto. Thus, if the machine part to which the stencil-stub is attached be the buttonbar now commonly in use, said stub may readily be placed around such button-bar,

the buttons thereon performing no useful function, and the stencil-sheet made fast to the free ends of the stub in manner above described, thereby adapting the machine for use with stencil-sheets unprovided with 0 enings designed to coact with such buttonar,

or with a stencil-sheet provided with such 0 enings but which openings have become distorted or otherwise injured.

Having now described m invention, what I claim as new therein and esire toisecure by Letters Patent is as follows In stencil-duplicating ap aratus, the combination of a drum, a mem er extending between the ends of the drum and moving therewith, a flexible, non-resilient stencilstub having a fold therein intermediate its lateral edges, said stub extending around said member, a stencil-sheet, and means for securing the edges of the sheet to both the lfatei'lal edges of said stub, substantially as set ort This specification signed and witnessed this 23rd day of March, 1905.

ALBERT B. DICK. Witnesses:

M. H. BURKART, W. G. ARNOLD. 

